Indoor or outdoor sampling of airborne particulates, 0-70 cubic feet per minute (cfm) [0-2 cubic meters per minute (cmm)] flow range, Spot or continuous monitoring, Portable and lightweight, Built-in rotometer for instantaneous flow reading, Includes 4" (10.16 cm) diameter filter holder assembly, For use in normal, non-explosive atmospheres, Complete accessories available for use with Total Suspended Particulate (TSP), PM10 and PM2.5 Systems for U.S. EPA compliance, Made in U.S.A.